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    SubjectRe: [patch/rft] jbd2: tag journal writes as metadata I/O
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    tytso@mit.edu writes:

    > On Mon, Apr 05, 2010 at 02:36:07PM -0400, Jeff Moyer wrote:
    >> >
    >> > What benchmark were you using to test small file writes? This looks
    >> > good to me as well, but we might want to do some extra benchmarking
    >> > just to be sure we're not accidentally introducing a performance
    >> > regression.
    >>
    >> iozone showed regressions for write and re-write in runs that include
    >> fsync timings for small files (<8MB). Here's the command line used for
    >> testing:
    >>
    >> iozone -az -n 4k -g 2048m -y 1k -q 1m -e
    >
    > iozone is showing performance regressions or performance improvements?
    > I thought the point of this patch was to improve iozone benchmarks?

    Sorry, Ted, what I meant to say was that iozone showed differences
    between deadline and cfq, where cfq's performance was much worse than
    deadline's.

    Thanks!
    Jeff


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